Reference signal configuration method, base station, and terminal

Abstract

This application relates to the field of communications technologies, and provides a reference signal configuration method, a base station, and a terminal, so as to configure a time-frequency resource on which a reference signal of a terminal is located, so that a reference signal corresponding to a terminal that uses a first waveform maintains a relatively low PAPR. The method includes: generating, by a base station, resource configuration information, where the resource configuration information is used to indicate a resource unit occupied by a reference signal of a first terminal, a time-frequency resource on which the resource unit is located includes a plurality of contiguous symbols in time domain and a plurality of contiguous subcarriers in frequency domain, the reference signal occupies at least one of the plurality of symbols, the reference signal is carried in a plurality of subcarrier groups on the symbol that carries the reference signal, each of the plurality of subcarrier groups includes a plurality of contiguous subcarriers, adjacent subcarrier groups are spaced by a preset quantity of subcarriers, the reference signal occupies one subcarrier in each subcarrier group, and the terminal uses a first waveform corresponding to the reference signal; and sending, by the base station, the resource configuration information to the terminal.

What is claimed is: 
     
         1 . A reference signal configuration method, comprising:
 generating, by a first terminal, a reference signal, wherein the first terminal uses a first waveform; and   sending, by the first terminal, the reference signal to a base station, wherein a time-frequency resource used to carry the reference signal comprises a plurality of contiguous symbols in time domain and a plurality of contiguous subcarriers in frequency domain, a resource unit in which the reference signal is located is carried in at least one of the plurality of symbols in the time-frequency resource, the reference signal is carried in a plurality of subcarrier groups on the symbol that carries the reference signal, each of the plurality of subcarrier groups comprises the plurality of contiguous subcarriers, adjacent subcarrier groups are spaced by a preset quantity of subcarriers, and the reference signal occupies one subcarrier in each subcarrier group.   
     
     
         2 . The method according to  claim 1 , wherein the first waveform is a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) waveform. 
     
     
         3 . The method according to  claim 1 , wherein each subcarrier in the plurality of subcarrier groups that carry the reference signal is used to carry a reference signal of a second terminal, wherein the second terminal uses a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform, and the reference signal of the second terminal is a demodulation reference signal (DMRS). 
     
     
         4 . The method according to  claim 1 , wherein each subcarrier group comprises two contiguous subcarriers. 
     
     
         5 . The method according to  claim 4 , wherein a subcarrier occupied by the reference signal in each subcarrier group is a subcarrier with a highest frequency or a subcarrier with a lowest frequency in the subcarrier group. 
     
     
         6 . The method according to  claim 1 , wherein each subcarrier group comprises three or more contiguous subcarriers. 
     
     
         7 . The method according to  claim 1 , wherein the reference signal is a demodulation reference signal (DMRS). 
     
     
         8 . A base station, comprising:
 a generation unit, configured to generate resource configuration information, wherein the resource configuration information is used to indicate a resource unit occupied by a reference signal of a first terminal, a time-frequency resource on which the resource unit is located comprises a plurality of contiguous symbols in time domain and a plurality of contiguous subcarriers in frequency domain, the reference signal is carried in at least one of the plurality of symbols, the reference signal is carried in a plurality of subcarrier groups on the symbol that carries the reference signal, each of the plurality of subcarrier groups comprises a plurality of subcarriers whose frequencies are contiguous, adjacent subcarrier groups are spaced by a preset quantity of subcarriers, the reference signal occupies one subcarrier in each subcarrier group, and the first terminal uses a first waveform; and   a sending unit, configured to send the resource configuration information to the first terminal.   
     
     
         9 . The base station according to  claim 8 , wherein the first waveform is a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) waveform. 
     
     
         10 . The base station according to  claim 8 , wherein each subcarrier in the plurality of subcarrier groups that carry the reference signal is used to carry a reference signal of a second terminal, wherein the second terminal uses a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform, and the reference signal of the second terminal is a demodulation reference signal (DMRS). 
     
     
         11 . The base station according to  claim 8 , wherein each subcarrier group comprises two contiguous subcarriers. 
     
     
         12 . The base station according to  claim 11 , wherein a subcarrier occupied by the reference signal in each subcarrier group is a subcarrier with a highest frequency or a subcarrier with a lowest frequency in the subcarrier group. 
     
     
         13 . The base station according to  claim 8 , wherein each subcarrier group comprises three or more contiguous subcarriers. 
     
     
         14 . A terminal, comprising:
 a generation unit, configured to generate a reference signal, wherein the first terminal uses a first waveform; and   a sending unit, configured to send the reference signal to a base station, wherein a time-frequency resource used to carry the reference signal comprises a plurality of contiguous symbols in time domain and a plurality of contiguous subcarriers in frequency domain, a resource unit in which the reference signal is located is carried in at least one of the plurality of symbols in the time-frequency resource, the reference signal is carried in a plurality of subcarrier groups on the symbol that carries the reference signal, each of the plurality of subcarrier groups comprises the plurality of contiguous subcarriers, adjacent subcarrier groups are spaced by a preset quantity of subcarriers, and the reference signal occupies one subcarrier in each subcarrier group.   
     
     
         15 . The terminal according to  claim 14 , wherein the first waveform is a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) waveform, and a reference signal of a second terminal is a demodulation reference signal (DMRS). 
     
     
         16 . The terminal according to  claim 14 , wherein each of a plurality of subcarriers occupied by the reference signal is used to carry the reference signal of the second terminal, wherein the second terminal uses a (CP-OFDM) waveform. 
     
     
         17 . The terminal according to  claim 14 , wherein each subcarrier group comprises two subcarriers. 
     
     
         18 . The terminal according to  claim 17 , wherein a subcarrier occupied by the reference signal in each subcarrier group is a subcarrier with a highest frequency or a subcarrier with a lowest frequency. 
     
     
         19 . The terminal according to  claim 14 , wherein each subcarrier group comprises three or more subcarriers.